Year	% gross
1970	8.61178970336914
1971	8.9968204498291
1972	9.00621032714844
1973	9.43064975738525
1974	10.3855400085449
1975	9.62666988372803
1977	11.9791698455811
1978	16.890380859375
1979	21.4821300506592
1980	24.0640602111816
1981	19.5075397491455
1982	19.6173305511475
1983	19.7132606506348
1984	21.1156196594238
1985	24.0376205444336
1986	25.6179790496826
1987	28.2352905273438
1988	30.2523002624512
1989	31.4973793029785
1990	34.8084716796875
1991	36.6197204589844
1992	39.8710899353027
1995	42.9747009277344
1996	46.1766395568848
1998	46.6581916809082
1999	61.206169128418
2000	67.7860107421875
2001	80.4148635864258
2002	84.4884033203125
2003	91.8766174316406
2004	92.0704193115234
2005	88.7089614868164
2006	88.3533477783203
2007	88.041748046875
2008	84.8012619018555